Right-click the cell that contains the field [Qty] , and click Add Total. This adds a sum of the quantity for each order to the totals row. In the empty cell to the left of Sum[Qty] , type the label  Order Total . You can add a background color to the totals row. Select the two sum cells and the label cell.
Ladder logic is the first in a series exploring different software programming methods how to choose the most appropriate model of computation based on system requirements and architecture. Future articles will cover textual, function block/data flow, state chart, and simulation and modeling methods.
Introduction to Basic Ladder Logic Instructions. Introduction. In this section we will cover some of the basic instructions used in PLC programming. These instructions are some of the most used instructions in PLC programming. Once we explain in detail the instructions then we will have a look at how we can implement and used those instructions in real life application.